Adding fiber to reduce net carbs

etompkinsdickey's Avatar

etompkinsdickey

01 Oct, 2011 08:21 AM

Dear Dr. Rosedale,
I would like to know if adding a fiber supplement such as psyllium when eating carbohydrates such as fruit or starchy carbohydrates, will reduce the net carbs being eaten at the meal. For example, if you made a smoothie that had a banana or apple in it but also drank a psyllium drink before the smoothie, would that reduce the carbohydrates of the banana by the fiber in the psyllium drink? Would adding fiber be a way of helping to manage carbs to allow a greater daily allowance or permit one to offset the effect of the carbs when a person finds himself in a situation where he doesn't have a lot of control over the food that is being served?

Thank you.
Elizabeth

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  1. 31 Posted by James Foreman on 16 Jan, 2019 03:24 AM

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    OK, I will add my caveat concerning how adding fiber does or does not reduce carbs in a meal. It is generally accepted when figuring the net carbs of a recipe to add all the carbs from all ingredients and subtract all the fiber from all the ingredients to determine the net carbs of the resulting dish. If like some have indicated adding additional fiber does not reduce the net carbs then why do we subtract total fiber of the recipe from today carbs to calculate the net carbs of the dish:

  2. Support Staff 32 Posted by Ken on 16 Jan, 2019 10:57 AM

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    Hi James

    The purpose of subtracting fiber from total carb is to find the total sugar content.

    • non-fiber carbs will eventually covert to sugar, which is not good -- so to find total sugar content, (even if it is said that no sugar is added) you subtract total fiber from total carb to find how much sugar actually there is.
    Total Carbohydrate is the: 
    dietary fiber and non-fiber combined
    
    Non-fiber will convert to sugar
    
    Fiber - is a carb, that does not convert to sugar
    
    Sugar - is a non-fiber carb
    
    Sugar Alcohol - is sugar
    
    Starches - converts to sugar
    

     

    Ken/   Rosedale Support Team

  3. 33 Posted by Tyler on 02 Mar, 2019 03:48 AM

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    It wouldn't reduce the overall net carbs of what you eat in the end, no. Using the above example of net carbs being the total amount of carbs from all ingredients in a recipe or dish less the amount of fiber from all ingredients is not correct. You determine the net carbs of a dish by adding all of the net carbs of all of the ingredients together. If you just add psyllium, you're just adding "0" net carbs to what you've already eaten.

  4. 34 Posted by Andy on 25 Mar, 2019 05:12 PM

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    Tyler is correct. I just fact checked him and he’s 100% on point.

  5. 35 Posted by Jonathan on 18 Apr, 2019 03:01 PM

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    Adding more fiber will not lower the net carbs. Here is an example, you eat a meal that has 30 carbs and 20 fiber, so that is 10 net carbs. You add 10 more fiber, but what happens if you now have a meal with 40 carbs and 30 fiber, STILL 10 net carbs. Because the finer adds to the total carbs.

  6. 36 Posted by Debbie ameche on 18 May, 2019 05:33 PM

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    If I add psyllium huskpowder to a baked potato can I reduce any of tha added fiber to get net carbs

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